Question

question 10
a common time for congenital anomalies to occur is:
a immediately following childbirth.
b in the last trimester of pregnancy.
c in early childhood.
d during the embryo stage.

Explanation:

Congenital anomalies are structural or functional abnormalities present at birth. The embryo stage (weeks 3 - 8 of gestation) is a critical period for organogenesis. During this time, the embryo is highly vulnerable to teratogens (agents that can cause birth defects). Any disruption during this stage can lead to major congenital anomalies as the basic body plan and organ systems are being formed. Immediately following childbirth (A) is too late as the anomaly would already be present. The last trimester (B) is more about growth and refinement rather than the formation of major structures. Early childhood (C) is after birth, and congenital anomalies are present at birth, so the cause is prenatal.

Answer:

D. during the embryo stage.